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PM0223 bảng dữ liệu(PDF) 61 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  This programming manual provides information for application and system-level software developers
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PM0223
The STM32L0 Cortex-M0+ Instruction Set
80
3.5.6
MULS
Multiply using 32-bit operands, and producing a 32-bit result.
Syntax
MULS Rd, Rn, Rm
where:
Operation
The MUL instruction multiplies the values in the registers specified by Rn and Rm, and places
the least significant 32 bits of the result in Rd. The condition code flags are updated on the
result of the operation, see 3.3.6: Conditional execution on page 43.
The results of this instruction does not depend on whether the operands are signed or
unsigned.
Restrictions
In this instruction:
•
Rd
, Rn, and Rm must only specify R0-R7.
•
Rd
must be the same as Rm.
Condition flags
This instruction:
•
Updates the N and Z flags according to the result.
•
Does not affect the C or V flags.
Examples
MULS
R0, R2, R0
; Multiply with flag update, R0 = R0 x R2
Rd
Is the destination register.
Rn, Rm
Ire registers holding the values to be multiplied.



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